Frequencies for first 10,000 rows of prev_acc variable in vehicle dataset :

   Previous |
   Recorded |
  Accidents |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,597       75.97       75.97
          1 |      1,482       14.82       90.79
          2 |        248        2.48       93.27
          3 |         50        0.50       93.77
          4 |         15        0.15       93.92
          5 |          6        0.06       93.98
         99 |        602        6.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016